#include<iostream>
#include<string>
using namespace std;


int main()
{
	string s1("hello");
	cout << s1 << endl;

	string s2(" world ");
	string s3(s2, 2, 3);
	cout << s3 << endl;

	string s4(6, 's');
	cout << s4 << endl;

	s4.clear();
	cout << s4 << endl;
	return 0;
}